Add ComponentHealth.attributes

[michel-laterman]

Add attributes in order to be consistent with what the healthcheck extension produces. See extension source.

• Closes Add attributes to ComponentHealth messages #326

[tigrannajaryan]

What are "attributes" supposed to carry? We need a more elaborate motivation before accepting this change.

Looking at the extension event, it says "attributes provides additional context or metadata for the event" which is very vague to me.

[michel-laterman]

For example the attributes of a hostmetrics scraper can include things to indicate specifics on which scrapers are failing, as seen in the extension issue is:

    "pipeline:metrics/1": {
      "healthy": true,
      "status": "StatusRecoverableError",
      "status_time": "2025-10-16T17:56:11.820542393+02:00",
      "attributes": {
        "error_msg": "not enough permissions to read cpu data",
        "scrapers": ["cpu", "memory", "network"]
      },

extension implementation pr.

It could further be used to indicate other metadata such as port numbers, address, etc.